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Revenue recognition and operating segments - Other segment items included in the consolidated income statement (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total £ 118 £ 74 £ 82
Amortisation and impairment of intangible assets, Tax effect (25) (18) (18)
Amortisation and impairment of intangible assets, Total after tax effect 93 56 64
Operating segments | North America      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 59 34 30
Operating segments | Europe      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 29 14 15
Operating segments | UK & Sub Saharan Africa      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total   9 9
Operating segments | Asia & MENAT      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 20 7 17
Operating segments | Pacific      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 4 4 4
Central and regional overheads      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total £ 6 £ 6 £ 7